Energy 03 - EK, Eg, ΔEth, W (again) (P)

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*For all situations, assume the
- object begins at the origin.
- h = 0 (zero height) is always at ground level.

* For energy bar charts, use as little energy blocks as possible to adequately represent the situation.

Email *

Example: A cubic spinosaurus is pulled upward with a rope. It is moving slowly upwards and slowing down.

The 640-kg spinosaurus traveled at 3.75 m/s [↑] when 13.5 m above the ground and then 0.855 m/s [↑] when 18.6 m above the ground. Determine the tension in the rope.

Answer On Paper

Solution On Paper

On a sheet of paper, complete the following for each situation below:

a. Sketch
b. Energy Bar Chart
c. Response to question/task
*Format: 𝘯𝘶𝘮𝘣𝘦𝘳[space]𝘶𝘯𝘪𝘵[space]𝘥𝘪𝘳𝘦𝘤𝘵𝘪𝘰𝘯(𝘢𝘴 𝘯𝘦𝘦𝘥𝘦𝘥)
e.g.
123.4 m/s [N], or
1.234x10(2) m/s [N]

1. A cubic pterodactyl is falling downwards through the air at a constant speed.

Determine the amount of energy lost by the 450-kg pterodactyl after falling 14.2 m.

2. A cubic tyrannosaurus is pushed up a hill of asphalt. The tyrannosaurus is moving slowly and speeding up.

The 6320-kg tyrannosaurus was pushed with a force of 1.16×10⁵ N and experienced a 1.03×10⁵ N force of friction while travelling 62 m along the hill. The tyrannosaurus was initially moving at 2.4 m/s and then moved at 3.4 m/s. What was the tyrannosaurus' change in height?

3. A cubic archaeopteryx is pushed East along a flat section of rough snow. It is moving slowly and at a constant speed.

If the coefficient of friction between the 0.868-kg archaeopteryx and the snow is 0.250, with what magnitude of force is the archaeopteryx pushed?

4. A cubic diplodocus is pushed down a super-smooth hill made of ice. It is moving slowly and speeding up.

The 1.93×10⁴-kg diplodocus is given 1.12×10⁶ J of energy as it changes its height from 22.3 m to 8.93 m. If the diplodocus was initially moving at 1.4 m/s, how fast is it moving now?

5. A cubic dilophosaurus is pulled along a flat section of dirt. The dilophosaurus is moving quickly and speeding up.

The 3270-kg dilophosaurus moved initially at 4.4 m/s and after being pulled 5.67 m is now moving at 8.0 m/s. If the coefficient of friction between the dilophosaurus and the dirt is 0.44 and the dilophosaurus was pulled with 3.12×10⁴ N of force, how much energy was taken out of the system by the air?

a. From the image below, select the sketch that best matches the one you drew for each situation.

5 points

1. pterodactyl

2. tyrannosaurus

3. archaeopteryx

4. diplodocus

5. dilophosaurus

Clear selection

1b. pterodactyl - Enter your energy bar chart below.

6 points

-4

-3

-2

-1

EK'

Eg'

ΔEth

Clear selection

1c. pterodactyl

Format: 𝘯𝘶𝘮𝘣𝘦𝘳[space]𝘶𝘯𝘪𝘵[space]𝘥𝘪𝘳𝘦𝘤𝘵𝘪𝘰𝘯(𝘢𝘴 𝘯𝘦𝘦𝘥𝘦𝘥)

1 point

2b. tyrannosaurus - Enter your energy bar chart below.

6 points

-4

-3

-2

-1

EK'

Eg'

ΔEth

Clear selection

2c. tyrannosaurus

Format: 𝘯𝘶𝘮𝘣𝘦𝘳[space]𝘶𝘯𝘪𝘵[space]𝘥𝘪𝘳𝘦𝘤𝘵𝘪𝘰𝘯(𝘢𝘴 𝘯𝘦𝘦𝘥𝘦𝘥)

1 point

3b. archaeopteryx - Enter your energy bar chart below.

6 points

-4

-3

-2

-1

EK'

Eg'

ΔEth

Clear selection

3c. archaeopteryx

Format: 𝘯𝘶𝘮𝘣𝘦𝘳[space]𝘶𝘯𝘪𝘵[space]𝘥𝘪𝘳𝘦𝘤𝘵𝘪𝘰𝘯(𝘢𝘴 𝘯𝘦𝘦𝘥𝘦𝘥)

1 point

4b. diplodocus - Enter your energy bar chart below.

6 points

-4

-3

-2

-1

EK'

Eg'

ΔEth

Clear selection

4c. diplodocus

Format: 𝘯𝘶𝘮𝘣𝘦𝘳[space]𝘶𝘯𝘪𝘵[space]𝘥𝘪𝘳𝘦𝘤𝘵𝘪𝘰𝘯(𝘢𝘴 𝘯𝘦𝘦𝘥𝘦𝘥)

1 point

5b. dilophosaurus - Enter your energy bar chart below.

6 points

-4

-3

-2

-1

EK'

Eg'

ΔEth

Clear selection

5. dilophosaurus

Format: 𝘯𝘶𝘮𝘣𝘦𝘳[space]𝘶𝘯𝘪𝘵[space]𝘥𝘪𝘳𝘦𝘤𝘵𝘪𝘰𝘯(𝘢𝘴 𝘯𝘦𝘦𝘥𝘦𝘥)

1 point

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